[Webkit-unassigned] [Bug 74366] New: [chromium] checkerboard layout test fails if using GL_LINEAR

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=74366

           Summary: [chromium] checkerboard layout test fails if using
                    GL_LINEAR
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: aelias at chromium.org
                CC: enne at google.com, sievers at chromium.org,
                    aelias at chromium.org


If the root layer is drawn using GL_LINEAR, then compositing/checkerboard.html fails.  To the naked eye, the checkerboard rendering looks the same as the reference image, but the imagediff shows slight imperfections exist near the right edge of the image.

This is currently worked around by turning off border texels on the root layer (which causes GL_NEAREST to be used instead).  The test failure can be reproduced by always passing in CCLayerTilingData::HasBorderTexels to createTiler() in TiledLayerChromium::prepareToUpdate().

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